Influence of fillers on free volume and gas barrier properties in styrene-butadiene rubber studied by positrons

被引：108

作者：

Wang, ZF

Wang, B ^{[1
]}

Qi, N

Zhang, HF

Zhang, LQ

机构：

[1] Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China

[2] Beijing Univ Chem Technol, Coll Mat Sci & Engn, Beijing 100029, Peoples R China

来源：

POLYMER | 2005年 / 46卷 / 03期

基金：

中国国家自然科学基金;

关键词：

positron annihilation; nanocomposite; fractional free volume;

D O I：

10.1016/j.polymer.2004.12.002

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The measurements of free-volume hole property by positron annihilation lifetime spectroscopy (PALS) have been carried out for polymer-clay nanocomposite materials that consist of styrene-butadiene rubber (SBR) and layered silicate clay of rectorite and conventional composite materials N326 (carbon black) /SBR. The PALS and differential scanning calorimeter (DSC) results show layered rectorite has a stronger effect on restraining polymer chain mobility which results in the decrease of fraction free volume and gas permeation than carbon black. The dispersion of nanoscale rectorite clay in SBR largely enhances gas barrier property in contrast to results obtained in N326/SBR system. Experimental results reveal that gas permeability in rectorite/SBR nanocomposite is mainly influenced by fractional free volume and tortuous diffusional path effects attributed to the clay plateletlike morphology. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：719 / 724

页数：6

共 30 条

[1] MOLECULAR TRANSPORT IN LIQUIDS AND GLASSES [J].